Implement a paginated fetching mechanism for all videos from an external service and synchronize them to the PostgreSQL database, handling both new insertions and updates for existing video records.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 2eb1084e-b728-4449-9231-f1665924c8d5
Replit-Commit-Checkpoint-Type: full_checkpoint